1 /* 2 * Copyright 1995-2019 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the OpenSSL license (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10 #include <stdio.h> 11 #include "internal/cryptlib.h" 12 #include <openssl/evp.h> 13 #include <openssl/asn1t.h> 14 #include <openssl/x509.h> 15 #include <openssl/x509v3.h> 16 #include "internal/x509_int.h" 17 18 ASN1_SEQUENCE_enc(X509_CINF, enc, 0) = { 19 ASN1_EXP_OPT(X509_CINF, version, ASN1_INTEGER, 0), 20 ASN1_EMBED(X509_CINF, serialNumber, ASN1_INTEGER), 21 ASN1_EMBED(X509_CINF, signature, X509_ALGOR), 22 ASN1_SIMPLE(X509_CINF, issuer, X509_NAME), 23 ASN1_EMBED(X509_CINF, validity, X509_VAL), 24 ASN1_SIMPLE(X509_CINF, subject, X509_NAME), 25 ASN1_SIMPLE(X509_CINF, key, X509_PUBKEY), 26 ASN1_IMP_OPT(X509_CINF, issuerUID, ASN1_BIT_STRING, 1), 27 ASN1_IMP_OPT(X509_CINF, subjectUID, ASN1_BIT_STRING, 2), 28 ASN1_EXP_SEQUENCE_OF_OPT(X509_CINF, extensions, X509_EXTENSION, 3) 29 } ASN1_SEQUENCE_END_enc(X509_CINF, X509_CINF) 30 31 IMPLEMENT_ASN1_FUNCTIONS(X509_CINF) 32 /* X509 top level structure needs a bit of customisation */ 33 34 extern void policy_cache_free(X509_POLICY_CACHE *cache); 35 36 static int x509_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, 37 void *exarg) 38 { 39 X509 *ret = (X509 *)*pval; 40 41 switch (operation) { 42 43 case ASN1_OP_D2I_PRE: 44 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_X509, ret, &ret->ex_data); 45 X509_CERT_AUX_free(ret->aux); 46 ASN1_OCTET_STRING_free(ret->skid); 47 AUTHORITY_KEYID_free(ret->akid); 48 CRL_DIST_POINTS_free(ret->crldp); 49 policy_cache_free(ret->policy_cache); 50 GENERAL_NAMES_free(ret->altname); 51 NAME_CONSTRAINTS_free(ret->nc); 52 #ifndef OPENSSL_NO_RFC3779 53 sk_IPAddressFamily_pop_free(ret->rfc3779_addr, IPAddressFamily_free); 54 ASIdentifiers_free(ret->rfc3779_asid); 55 #endif 56 57 /* fall thru */ 58 59 case ASN1_OP_NEW_POST: 60 ret->ex_cached = 0; 61 ret->ex_kusage = 0; 62 ret->ex_xkusage = 0; 63 ret->ex_nscert = 0; 64 ret->ex_flags = 0; 65 ret->ex_pathlen = -1; 66 ret->ex_pcpathlen = -1; 67 ret->skid = NULL; 68 ret->akid = NULL; 69 ret->policy_cache = NULL; 70 ret->altname = NULL; 71 ret->nc = NULL; 72 #ifndef OPENSSL_NO_RFC3779 73 ret->rfc3779_addr = NULL; 74 ret->rfc3779_asid = NULL; 75 #endif 76 ret->aux = NULL; 77 ret->crldp = NULL; 78 if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_X509, ret, &ret->ex_data)) 79 return 0; 80 break; 81 82 case ASN1_OP_FREE_POST: 83 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_X509, ret, &ret->ex_data); 84 X509_CERT_AUX_free(ret->aux); 85 ASN1_OCTET_STRING_free(ret->skid); 86 AUTHORITY_KEYID_free(ret->akid); 87 CRL_DIST_POINTS_free(ret->crldp); 88 policy_cache_free(ret->policy_cache); 89 GENERAL_NAMES_free(ret->altname); 90 NAME_CONSTRAINTS_free(ret->nc); 91 #ifndef OPENSSL_NO_RFC3779 92 sk_IPAddressFamily_pop_free(ret->rfc3779_addr, IPAddressFamily_free); 93 ASIdentifiers_free(ret->rfc3779_asid); 94 #endif 95 break; 96 97 } 98 99 return 1; 100 101 } 102 103 ASN1_SEQUENCE_ref(X509, x509_cb) = { 104 ASN1_EMBED(X509, cert_info, X509_CINF), 105 ASN1_EMBED(X509, sig_alg, X509_ALGOR), 106 ASN1_EMBED(X509, signature, ASN1_BIT_STRING) 107 } ASN1_SEQUENCE_END_ref(X509, X509) 108 109 IMPLEMENT_ASN1_FUNCTIONS(X509) 110 111 IMPLEMENT_ASN1_DUP_FUNCTION(X509) 112 113 int X509_set_ex_data(X509 *r, int idx, void *arg) 114 { 115 return CRYPTO_set_ex_data(&r->ex_data, idx, arg); 116 } 117 118 void *X509_get_ex_data(X509 *r, int idx) 119 { 120 return CRYPTO_get_ex_data(&r->ex_data, idx); 121 } 122 123 /* 124 * X509_AUX ASN1 routines. X509_AUX is the name given to a certificate with 125 * extra info tagged on the end. Since these functions set how a certificate 126 * is trusted they should only be used when the certificate comes from a 127 * reliable source such as local storage. 128 */ 129 130 X509 *d2i_X509_AUX(X509 **a, const unsigned char **pp, long length) 131 { 132 const unsigned char *q; 133 X509 *ret; 134 int freeret = 0; 135 136 /* Save start position */ 137 q = *pp; 138 139 if (a == NULL || *a == NULL) 140 freeret = 1; 141 ret = d2i_X509(a, &q, length); 142 /* If certificate unreadable then forget it */ 143 if (ret == NULL) 144 return NULL; 145 /* update length */ 146 length -= q - *pp; 147 if (length > 0 && !d2i_X509_CERT_AUX(&ret->aux, &q, length)) 148 goto err; 149 *pp = q; 150 return ret; 151 err: 152 if (freeret) { 153 X509_free(ret); 154 if (a) 155 *a = NULL; 156 } 157 return NULL; 158 } 159 160 /* 161 * Serialize trusted certificate to *pp or just return the required buffer 162 * length if pp == NULL. We ultimately want to avoid modifying *pp in the 163 * error path, but that depends on similar hygiene in lower-level functions. 164 * Here we avoid compounding the problem. 165 */ 166 static int i2d_x509_aux_internal(X509 *a, unsigned char **pp) 167 { 168 int length, tmplen; 169 unsigned char *start = pp != NULL ? *pp : NULL; 170 171 /* 172 * This might perturb *pp on error, but fixing that belongs in i2d_X509() 173 * not here. It should be that if a == NULL length is zero, but we check 174 * both just in case. 175 */ 176 length = i2d_X509(a, pp); 177 if (length <= 0 || a == NULL) 178 return length; 179 180 tmplen = i2d_X509_CERT_AUX(a->aux, pp); 181 if (tmplen < 0) { 182 if (start != NULL) 183 *pp = start; 184 return tmplen; 185 } 186 length += tmplen; 187 188 return length; 189 } 190 191 /* 192 * Serialize trusted certificate to *pp, or just return the required buffer 193 * length if pp == NULL. 194 * 195 * When pp is not NULL, but *pp == NULL, we allocate the buffer, but since 196 * we're writing two ASN.1 objects back to back, we can't have i2d_X509() do 197 * the allocation, nor can we allow i2d_X509_CERT_AUX() to increment the 198 * allocated buffer. 199 */ 200 int i2d_X509_AUX(X509 *a, unsigned char **pp) 201 { 202 int length; 203 unsigned char *tmp; 204 205 /* Buffer provided by caller */ 206 if (pp == NULL || *pp != NULL) 207 return i2d_x509_aux_internal(a, pp); 208 209 /* Obtain the combined length */ 210 if ((length = i2d_x509_aux_internal(a, NULL)) <= 0) 211 return length; 212 213 /* Allocate requisite combined storage */ 214 *pp = tmp = OPENSSL_malloc(length); 215 if (tmp == NULL) { 216 X509err(X509_F_I2D_X509_AUX, ERR_R_MALLOC_FAILURE); 217 return -1; 218 } 219 220 /* Encode, but keep *pp at the originally malloced pointer */ 221 length = i2d_x509_aux_internal(a, &tmp); 222 if (length <= 0) { 223 OPENSSL_free(*pp); 224 *pp = NULL; 225 } 226 return length; 227 } 228 229 int i2d_re_X509_tbs(X509 *x, unsigned char **pp) 230 { 231 x->cert_info.enc.modified = 1; 232 return i2d_X509_CINF(&x->cert_info, pp); 233 } 234 235 void X509_get0_signature(const ASN1_BIT_STRING **psig, 236 const X509_ALGOR **palg, const X509 *x) 237 { 238 if (psig) 239 *psig = &x->signature; 240 if (palg) 241 *palg = &x->sig_alg; 242 } 243 244 int X509_get_signature_nid(const X509 *x) 245 { 246 return OBJ_obj2nid(x->sig_alg.algorithm); 247 } 248